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Operation
- If on, turn off NIM crate to disable interlock (otherwise chiller won't start)
- Turn on SVT power supply crate (turn key to "local on"), make sure red "interlock" light comes on (i.e. tripped)
- Set flow manifold valves
- Start chiller (power button on front panel)
- Turn on NIM crate, make sure Arduino's green "ON" light and flow switch's red "flow above threshold" light turn on, SVT power supply's red interlock light turns off
- Do stuff to start power and DAQ
SVT Lab Layout
Top half:
- physically on away side from chiller
- cooling loop on away side from chiller
- flange with long cable outside thermal box
Systems
Power
CAEN SY1527
Serial console
Serial port is connected to Windows desktop; run HyperTerminal (Start/Prorams/Accessories/Communication/HyperTerminal) and open the "CAEN SY1527" shortcut (set to COM1, 9600 baud, hardware flow control).
Instructions
In the current setup:
Slot |
PS |
Type |
0 |
A509 |
DVDD for all hybrids |
3 |
A509H |
AVDD, V125 and bias |
6 |
A509H |
AVDD, V125 and bias |
9 |
A509H |
AVDD, V125 and bias |
[Update with correct slot/ch assignment valid for group C]
Mapping between the SY527 slots and channels to hybrids can be found: half-module assignments - Power supply assignments updated.pdf .
Cooling
Chiller
Polyscience 6506T
Max outlet pressure set to 40 psig using internal pressure bypass
Test of serial port (serial_hps_chiller.ino )
Interlock board
Arduino Leonardo (http://arduino.cc/en/Main/ArduinoBoardLeonardo)
Source code: serial.ino (serial_hps_svt.ino)
Need micro-USB cable to reprogram. Software is already installed on Windows laptop.
Inputs:
- HTM2500LF temperature+humidity sensor inside Lexan box
- Flow switch in cooling system return line
- RS-232 connection to chiller - status, set T, measured pressure/flow/T
Thresholds:
- Ambient T inside SVT Lexan box < 25 C (set in Arduino script)
- Ambient RH inside SVT Lexan box < 5 % (set in Arduino script)
- Cooling system flow > 20 GPH (adjustment screw on flow switch)
Logic:
- Check inputs every 1 s; if any input is abnormal, trip and stay tripped (must reset Arduino board to clear)
Outputs:
- RS-232 to chiller: if tripped, send "stop" command every 1 s
- Interlock to CAEN crate (5V normal, 0V tripped) - trip turns off all outputs immediately
- Prints inputs to USB serial connection every second (if plugged in)